I'm not sure what level you are but judgement is a great one. Gives that judgement card, possibly some other cards, and may cast heals. But sea dragon is also a great choice. I've had good experiences with both of my ghost dragons. They both got the spritely talent at teen, and although they're death pets, most of their talents can be used by any school. Storm beetle is the same way. That star fish thing is a good pet, too.

Starfish is a good starting pet for talents. I personally prefer hatching talents I like into pet Enchanted Armament. They give you up to 3 Sharpen Blade cards on top of whatever talents you can hatch into them.